ComicArtist Posted June 12, 2012 Report Share Posted June 12, 2012 Wrapping up my KA swap into the FC, and I figured since I know you guys here and like you better, I'd ask a question here instead of Zilvia or something. I've got ECU power and ignition power, checked for spark and I've got it. Timing is correct, I have fuel pressure, injectors just aren't firing. Now, im wiring all this in from the harness that goes to the main engine fuse block on a S13. I'm pretty sure I'm missing power to like one wire that controls the injector pulse. Grounds are good, the engine will actually start and run on carb cleaner. Just can't figure out which wire I'm missing. Figure with the amount of KA swaps that take place here, somebody will know. Thank you! Quote Link to comment
sssr20det510 Posted June 12, 2012 Report Share Posted June 12, 2012 Its controlled by the ecu Quote Link to comment
xzile609 Posted June 12, 2012 Report Share Posted June 12, 2012 How much fuel pressure? Did you make sure that the fuel feed and return lines are not reversed usually a common issue. Quote Link to comment
ComicArtist Posted June 12, 2012 Author Report Share Posted June 12, 2012 I thought it was fuel pressure at first so I put a Walbro 255 in it. I tried switching the lines but no good. Of course, it only has a gallon of gas in it. There could be getting air in the lines. Quote Link to comment
sssr20det510 Posted June 12, 2012 Report Share Posted June 12, 2012 Id put more gas in it Quote Link to comment
ComicArtist Posted June 12, 2012 Author Report Share Posted June 12, 2012 Yes lol. The thought actually just occurred to me a few minutes ago, idk why I didn't think of it last night. Dammit I don't get off work for two more hours. I want this thing to drive. Quote Link to comment
ComicArtist Posted June 13, 2012 Author Report Share Posted June 13, 2012 More gas didn't work. Right now, I have the main ecu power and ignition wires powered. I have spark. Whenever I power the rest of the wires on that plug, I have faint injector pulse. However, the first time I powered all of them, it actually worked, started, and ran until I unplugged them. Now it won't do it. It's almost like a bad ground, but both the engine harness grounds are connected. What else could keep the injectors from pulsing? Quote Link to comment
Kisor Posted June 13, 2012 Report Share Posted June 13, 2012 It sounds like you have a power supply problem. The injectors recieve 12v pos itive whenever key is on. Use a test light or meter to verify, that should always be there. The PCM supplys a ground to fire the injector. Use this for wiring reference: http://forums.nicoclub.com/240sx-fsm-full-service-manuals-s13-s14-ka24e-ka24de-t311075.html I can't get it to load on my crappy connection right now or I would post up diagrams. Quote Link to comment
ComicArtist Posted June 13, 2012 Author Report Share Posted June 13, 2012 I have a full 12v at the injectors when the key is on, so the ground is the one not pulsing. If I jump a ground to the injectors, they spray fine. Quote Link to comment
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